Watch Carmelo when he lays it up. You'd be surprised how effective going up both hands with the ball clamped works. I've just started trying this and it is very effective in getting the shot up and even getting fouled.

Go up strong and hard and in the event that you miss, you'll rarely get blocked as you've clamped the ball that hard its not going anywhere. And if they try and block it you'll probably be rewarded with foul shots.